-56.32% is the change from 641 to 280
Calculation steps:
[( 280 - 641 ) ÷ 641] x 100 = -56.32%
Formula
Percentage change = [(280 - 641) / 641] x 100
Subtract the new number by the original number
280 - 641 = -361
-361 ÷ 641 = -0.5631825273010921
-0.5631825273010921 x 100 = -56.32%